WBS 1 

10 April 2002

Presentations/Technical Reports

Minutes

We held our regular weekly telecon between ORNL and PPPL.  The first item of discussion was the Work Breakdown Structure for WBS 1.  Reiersen proposed a WBS that was discussed, modified during the course of the telecon, and will be used as the basis for CDR costing.

Cole discussed development in the vacuum vessel area.  It was noted that vertical access for personnel access to the vacuum vessel is undesirable.  The apparent solution is to put a large port on the v=0 plane at the outboard horizontal midplane (between the two NB).  Further work is also required to show how people will work inside the vacuum vessel (Action: Cole).  It would be nice to be able to put down some feet (perhaps through the holes made for the vertical ports) on which we could make a platform or catwalk for people to crawl in and work from.

Cole showed an unfolded view of the ports that looked very good.  There was some discussion of routing feedthroughs that did not require line-of-sight.  Nelson suggested that we could bring feedthroughs out through the sides of the larger horizontal ports, thereby not using up line-of-sight views that might otherwise be used.  This appeared to be a very sensible position.  Cole also described in considerable detail the spool piece that will be featured at the CDR.

Williamson discussed progress in the structural analysis area.  An impressive FEA model of the shell and windings was presented.  First stress calculations should be provided next week (Action: Williamson/Fan).

Williamson also showed a sterolithography model of a field period.  Apparently, the modular coils do indeed slide over the vacuum vessel.  (And the audience breathed a collective sigh of relief!)  It should be extremely valuable for the CDR.

Nelson discussed progress in developing properties for the cable conductor.  The stiffness appears softer than would be calculated in a simple parallel mixture rule, which should bode well for thermal stresses.  The structural analysis will use parametric values of stiffness ranging from 5% to 50% the stiffness of copper, which should bracket the real situation (roughly 10%)..

Nelson went on to discuss the PFC implementation.  It was determined that four configurations should be discussed at the CDR:

1. The initial configuration with poloidal limiters straddling the v=0.5 planes for Phases 1-3.

2. A full shell (conformal to the VV) that provides the inboard limiter, helical divertor, fast ion loss armor, and NB armor functions to be installed prior to Phase 4.

3. A baffled divertor to be incorporated in the full shell prior to Phase 5.

4. Divertor pumping to be added for long pulse operation prior to Phase 6.

Mioduszewski is supposed to discuss the implementation in more depth at the 4/11 Physics meeting.

The last agenda item was the schedule for submitting WBS 1 cost inputs.  Nelson said these would be in not later than Monday, 4/15 (Action: Nelson).

Please forward any comments or corrections to reiersen@pppl.gov

(last edited on 04/19/2002 04:18 PM )